Blindstitch sewing machine



Sept. 29, 1931. Y K MAlER ET AL 1,825,642

BLINDSTITCH SEWING MACHINE Filed July 26, 1927 7 Sheets-Sheet 1 Sept. 29, 1931. K. MAKER ET AL BLINDSTITCH SEWING MACHINE Filed July 26, 1927 7 Sheets-Sheet 2 n J I I I 2 w m u m o n n 0 n a F j 4 l I W w 6 Sept. 29, 1931. K. MAIER ET AL BLINDSTITCH SEWING MACHINE Filed July 26, 1927 '7 Sheets-Sheet 3 Sept. 29, 1931. K. MAIER ET AL BLINDSTITCH SEWING MACHINE Filed July 26, 1927 7 Sheets-Sheet 4 7 g'rmmdow. M-%m,

Sept. 29, 1931. K, MA|ER ET AL 1,825,642

BLINDSTITCH SEWING MACHINE Filed July 26, 192 7 '7 Sheets-Sheet 5 gin wanton M MW a alike: "up,

Sept. 29, 1931. K. MAIER ET AL BLINDSTITCH SEWING MACHINE Filed July 26, 1927 7 Sheets-Sheet 6 IIIIIIIIIIIIIJ P 1931- K. MAKER ET AL 1,825,642

BLINDSTITCH SEWING MACHINE Filed July 26, 1927 7 Sheets-Sheet 7 Patented Sept. 29, 1931 UNITED-STATES] PATENT OFFICE KARL MAIER AND rmnmucn Lurz or STUTTGAR'I', GERMANY, Assreivoias '10 UNION SPECIAL MASCHINENFABRIK, e. M. B. 11., or STU'I'TGART, GERMANY BLIivnsrriTcn snwme MACHINE Application-filed m 26, 1927, Serial No. 208,472, and in Germany October 14,1926.

i The invention relates to new and useful improvements in blind stitch sewing machines,

and more particularly to a blind stitch sew ing machine wherein the entire stitch forming elements are supported above the mate- 3, showing a portion of the parts and showing some parts in section;

rial being stitched. Y

An object of the invention is to provide a,

machine of the above type with a suspended tubular work supporting arm, oil from the end of whichthe material is fed as it is bein'g stitched. o

A further object of the invention is to A provide amachine of the above type wherein the stitch forming mechanism forms through and through stitches enteringand emerging from one face of the sections of material being joined, and also covering stitches which extend over the .united parts of the fabric sections.

A further object of the invention is to'provide a machine ofthe above type wherein the stitch forming mechanism maybe ad-' justed bodily to accommodate fabrics of dif- .ferent thicknesses.

. embodying the improvements;

A further object. of the invention is to provide a machine'of the abovetype wherein the needle and looper of the stitch forming mechanism are positively-actuated by the same shaft." --o A further object of the invention'is to providea machine of the above type which includes a supporting standard havingan overhanging portion which supports a head on which the stitch forming mechanism is mounted, and also a depending. member which carries the tubular work supporting arm. r i i These and other objects will inpart be obvious and will in part be hereinafter more fully disclosed, Y

In the drawings which show b -way of illustration one embodiment oft e inven- Figure 1 is a front view' of the machine Fi 2 ,s a. transverse sectional view through the machine in a plane parallel with the main shaft and at right'ang'les to the longitudinal axis of the work supporting arm; i

nism in a plane extending .the work supporting arm;

7 Fig. 3 is a vertical sectional view through the housing for the stitch forming mechalongitudinally of Fig. 4 s an enlarged view similar to Fig.

Fig. 5 is an enlarged sectional view through the end of the work supporting arm, the presser foot, and the supporting means for the stitchforming-elements;

F ig. 6 is a transverse sectionalview on an" enlarged scale at right angles to the line of feed, and showing the needle and looper actuating mechanisms; I

Fig. 7 1s a horizontal sectional VIGW- through the upper portion of the housing for the stitch forming mechanism; 1

Fig. 8 is, a vertical sectional view showing the looper operating mechanism;

Fig. 9, is a vertical sectional view at. right angles to the-line of feed, showing the means shownin Fig. 12;.

Fig. 14' is a perspective view showing the seam in its formation and after the same has been flattened out, and

Fig. 15 is a. transverse sectional view through the seam shown in Fig. 12.

The invention is directed broadlyto a blind ric sections. for the forming of the seam stitch sewin machine which is particularly adapted for oining fabric sections by stitches passin .into and emerging from the same face o the fabric sections, which united fab- '-ric sections may be placed after they are joined so as to formsa flat-seam. The machine includes a suspended tubular work s pfportiiig: arm containing. a feeding; mec anism for feeding the fabric sections to be joined. along the work supporting arm and off from the end thereof after they are stitched. The machine also includes a supporting standard having an overhanging portion carrying a depending member, at the lower end of which the tubular work sup porting arm is mounted, said tubular arm being offset from the standard, so as to give ample room to the operator for guiding the material along the work supporting arm as it is stitched. The machine is provided with a housing which overhangs the free end of the work supporting arm, and the entire stitch forming mechanism is mounted in this housing. The stitch forming mechanism includes a needle which is preferably curved, and so disposed that as it oscillates, it will enter one section of fabric and emerge from the other section. Thus the needle thread loops are carried through the fabric sections.

.The needle is preferably positioned relative to the work supporting arm so that these stitches do not show on the under face of the material being stitched. The thread carrying looper cooperates with the needle and'is preferably constructed and operated so as to enter the needle thread loop which emerges from one fabric section, and then moved tn the other side of the meeting edges of the fabric sections where the looper thread loop is positioned for the needle to enter. This forms not only locking loops for the needle thread loops, but covering threads which cover the meeting edges or the fabric sections. The entire stitch forming mechanism is mounted on a. shaft which is capable of vertical adjustment so as to change the position of the path of movement of the needle relative to the work support for varying thicknesses of material. Associated with the material is a pair of cutting devices which may b used for trimming the folded back edge portions of the fabric sections in the forming of certain characters of seam.

Referring more in detail to the drawings, the machine consists of a frame 3 which includes a supporting base 3, an overhanging arm 3 carrying a forwardly projecting mem- 'ber 3, at the outer end of which is a depending member 3 and this depending member at its lower end carrles a tubular work supporting arm 3". This tubular work suppor ing arm 3 is suspended and is spaced from the standard or frame 3 which carries the overhanging arm. This gives ample room for the operator to reach along the inner side of the tubular work supporting arm 3 for holding the fabric sections to be stitched on the arm and guiding the same to the stitching mechanism. At the free end of the work supporting arm there is a presser foot 27 which is provided with a shank 33 adapted to be secured to the lower end of the presser bar 32. The presser bar 32 is free to move in the bearings 34 in the housing at the outer end of the overhanging arm 8 On the presser bar is a collar 3'5 and a spring 30 hearing against said collar normally holds the presser foot yieldingly pressed against the materialand in cooperative relation to the feed dog located within the work supportingarm. The presser bar is raised by means of an arm 37 carried by a shaft 39. Attached to the shaft 39 is-a lever 38, and any suitable means may be connected to the outer end 41 of this lever 38 for depressing the same for raising the presser foot. A spring 40 attached to the arm 37 raises the outer end of the lever 38. The material is fed off the end of the work supporting arm by means of a feed dog 81 carried by the feed bar extending lengthwise of the tubular work supporting arm. The feed bar is actuated by the eccentrics l and 4" mounted on the main shaft 4 journaled in the frame of the machine. This feed bar actuating mechanism is of the usual construction, and detail description thereof is not thought necessary. It may consist of a single feed dog or two feed dogs which may be given aditierential movement relative to each other, if desired. The main shaft 4: is journaled in the bean ings 1 and 2 of the frame, and is driven by a 7 belt wheel 6. A hand wheel 5 is provided for turning the shaft, when desired. As clearly shown in the drawings, the presser foot is provided with sections 43 which are inclined upwardly toward the center of the foot, and centrally of the foot is an opening 43 in which the needle operates for stitching the fabrics. Two separate and independent fabrics may be joined, or the edge portions of a tubular fabric may be oined. The parts to be joined are indicated at 82 and 83 in Fig. 13 of the drawings. These sections are fed along the work supporting arm and beneath the inclined sections 43 of the presser foot 27. The throat plate 4E3 carried by the tubular work supporting arm is shaped to conform to the under face of the presser foot, and this holds the two fabric sections in planes which are inclined to each other, with their edges to be united meeting at the center of the foot and centrally of the opening in the foot.

The two fabric sections are united by a needle 84 which as shown in the drawings, is a curved needle. As shown in Fig. 13, the fabric sections are placed so that the needle enters the fabric section 82 back from the edge or corner theinof, and said needle will pass from one fabric section into the other, emerging from the fabric section 83. The path of the needle is beneath the corners 85 of the -fabric sections. The needle in its movement passes through the adjacent edges 86 of the .fabric sections. Referring to Figures 12 to 15, the needle thread is indicated at 87 This thread is in loop form, lying in a channel89 formed by the needle. It is noted. that the needle thread loops do not pass through to the under face of the fabric sections, and will, therefore, be concealed from View on the under face of the material. Thus it is that the stitch formed is referred to as a blind stitch. The needle thread loops are secured by the looper thread which is formed into loops 88, the looper-thread loop 88 being passed through a needle thread loop and thence across the meeting edges 90 of the fabric sections 82, 83, where the looper thread loop is positioned so that the needle 84-. on its nest passage into the fabrics will enter the looper thread loop. Thus it is that a blind stitch fiat seam is formed with the edges abutted as shown in Figures 1.2 and 15. The faloric sections are inclined to each other during the actual formation of the stitches, but when the stitches are finally set, and the fabric sections brought back to a flat position, then the fabric sections lie in the same plane and are united by threads which do not show on one face of the goods, and threads which two sections will be completely cover and conceal the meeting edges of the fabric sections on the other face of the goods.

Figures 10 and 11, a slightly modified form of seam is shown. The fabric sections 7t), 76 are folded back as indicated at 71, 71, and are guided into the machine so that these joined at their meeting folded edge portions. The needle for unitthe fabric sections is indicated at 19 in 10. The fabric sections are so positioned that the needle penetrates the folded portion of one of the fabric sections, then passes through the two fabric sections which are joined at 73, after which it emerges from the other folded fabric section. The needle th is indicated at 7% in these figures. The looper thread is indicated at 75 and operates lock the needle thread loops and cover the meeting edges of the fabric sections in preciscly the manner described above. In Fig.

10, the folded edge portions projecting be- :e he finished concatenations of the l .0 threads, are shown as trimmed off along the use 1 2, 72. The looper moves in the direcof the arrow A when entering the needle lloop, thence in the direction of the arto the other side of the meeting edges he fabric sections, thence in the direction arrow C, after the needle has entered the looper thread loop, and finallyin the direction of the arrow D to its initial starting ition. lltis understood, of course, that e looper is moving continuously. T e ns of seams have been described in detail, manner of making the same, asit is me mechanism whereby the stitch fori-on is accomplished. an the description of the mechanism, the

2 needle 19 alone will be referred to, it being eved it will greatly aid in an understand-- stud 12. An eccentric strap cooperates with an eccentric on the shaft 9, and the head 11 of the eccentric strap 10 engages the ball stud 12. The shaft 9 extends transversely across the housing at the outer end of the overhanging arm, and is journaled in suit able bearings in said housing. Rigidly attached to the shaft 9 is a spiral gear 8 and this spiral gear meshes with a spiral gear 7 on the main actuating shaft 4. When the main shaft is rotated, it will rotate the shaft 9, and the eccentric strap 10 will oscillate the arm 14 which will in turn oscillate the yoke, and as the yoke oscillates, the arm 18 will be vibrated, and this will cause the needle 19 to penetrate the fabric and be retracted from the fabric.

Cooperating with the needle 19 is a looper 42. This looper has, in effect, three distinct movements. Tt 1s oscilated to cause the same to enter the needle thread loop and to Withdraw therefrom. ft is also raised and lowered so that it may pass over the abutted edge portions of the fabric sections as the fabric sections lie in their inclined position, and it is also moved laterally from one side of the meeting edges of the fabric sections to the other side thereof. The looper 42 is carried by aflooper supporting shaft 44. The loop; er supporting shaft 44 is provided with a ball stud 47. The eccentric strap 46 is attached to this ball stud, and the eccentric strap is pro vided with a head which cooperates with an ecentric on the shaft 9. As this shaft rotates, the eccentric, through this strap and the ball stud connection with the looper shaft, will oscillate the looper shaft about its longitudinal axis. The looper is curved and offset, so that the oscillations of the shaft which support the same will move the looperinto and out of the needle thread loop.

The second movement is imparted to the looper in the following manner. The looper shaft 44 is mounted in the sleeve 48 formed in two spaced sections, one on each side of the ball stud 47. These sections are connected by a bridge member 50, and a ball stud 51 is attached to this bridge member. An eccentrio strap 52 engages the ball stud 51, and this eccentric'strap carries a head 53 which coopperates with an eccentric on the shaft .9. The lowersection of the sleeve 48 is formed integral with a collar .19 which is mounted on the stationary shaft 18. The ballstud 51 is located some distance above this shaft 13, and therefore, as the shaft 9 rotates, strap 52 will swing .the collar 49 on the stationary shaft 13, and this will bodily swing the eccentric lac the sleeve 48 so as to carry the looper from one side of the meeting edges of the fabric sections to the other side thereof.

The third movement of the looper is accomplished in the following manner. At the upper end of the looper shaft 44 is a sleeve 67 which is located between collars 68 and 69 attached to the looper shaft. The sleeve 67 is free on the looper shaft, but cannot move endwise thereon. A link 65 is pivotally connected to a depending portion carried by an arm projecting from the sleeve 67 at (36. The link (55 at its lower end, is pivoted at 64 to an elbow lever 63. This elbow lever 63 is fulcrumed at (ll on a projecting arm 62 which is formed integral with the upper section of the sleeve 48. A link 60 is pivoted to this lever (13 at its elbow, and this link 60 is pivoted at 59 to an arm 57 carried by a hub or collar 58 which is freely mounted on the stationary shaft 13. On the arm 57 is a ball stud 56. An eccentric strap 55 is connected to this ball stud,and the eccentric strap 55 cooperates with an eccentric 54: on the shaft 9. As the shaft; 9 rotates,this eccentric lwilloscillate the arm 57, and the oscillations of the arm will raise and lower the link 60 and this will oscillate the lever 63 which is fulcrumed on the sleeve supporting the looper shaft. The oscillations of the lever 63 through the link 65 will move the looper shaft endwise in this supporting sleeve. It will be understood from the above that the lever 63 moves bodily with the looper in its oscillations, and thus it is that the mechanism described will raise the looperat one side of the meeting edges of the fabric sections, lower it at the other side, again raise it and lower it. when it reaches its initial starting position. (if course, the looper moves continuously, and the parts are so timed that the looper will partake of the movements described in detail in connection with Fig. 11 of the drawings, and as indicated by the arrows in said figure.

In order that the stitch forming mechanism as a unit may be raised and lowered for fabrics of different thicknesses means has been provided for raising and lowering the stationary shaft 13. The stationary shaft 18 is provided with recesses 20, 20 in the opposite ends thereof. Extending into these recesses are supporting pins 21, The upper face of each pin is inclined as indicated at 78. Each pin is threaded and is mounted in a bearing in the frame 8 of the machine, so that it can be moved endwise the bearing. This is accomplished by a collar T, one, of course, for each pin. The collar has threaded engagement with the pin and screws 79 with their inner ends tapered are carried by the collar and these screws project into an annular groove 80in the hearing 7? for the pin. By turning the collar 76 in. one direction the pin controlled thereby ma e moved. i to the recess 20, and this, three with the inclined face of the stationary shaft, will raise the shaft. The turning of the collar in the opposite direction will withdraw the pin, and allow the shaft to move downward. The spring 24 at each end of the shaft cooperates with its respective pin in lowering the shaft when the pins are withdrawn. By the above devices, the stitch forming mechanism as a unit may be" raised and lowered. The work supporting arm is in a fixed position, and when the needle is raised relative to this fixed position of the work supporting arm, its path of movement will be further removed from the arm. By this adjustment of the needle path, fabrics of different thick nesses may be stitched, and a channel formed through the fabric sections properly placed therein, so that the stitches formed will be blind stitches, and the joining threads concealed from View on one face of the fabric sections.

A cutting device is sometimesdesirable to trim the projecting edge portions of the foldcd hack parts of the fabric sections. This may be accomplished by providing a pair of knives 25 which cooperate with a stationary knife 26 attached to the presser foot. The knives 25 are raised and lowered, and will cooperate with the stationary ledger blade 26 for independently cutting its respective fabric section. The knives 25 are raised and lowered in the following manner. The knives are fixed to the lower end of a rod 31 which is located in the lower portion of the presser bar 32, said presser bar being bore to form a recess for said rod 31. The rod has a cross head attached thereto adjacent lctl upper end, and this cross head is made in two parts threaded together, so that the cross head projects outwardly through slots in the presser bar and beyond the face of the presser bar. The ends of the cross head are slotted to receive the cams 29. The cams 25) are joined at their lower ends and secured by screws 28, 28 to the yoke 17 which carries the arm on which the needle is mounted. The cams 29 are so shaped that when the yoke l'l" oscillates, these cams sliding in the cross head will raise and lower the cross head. This will raise and lower the rod 31 which in turn lar work supporting arm, and will be fed to the stitching mechanism and off from end of the arm by a feed dog located within the tubular supporting arm. its the needle vibrates, it will pass through the space in the presser foot into and out of the fabric sec-- tion. The looper, by the mechanism do scribed, entersthe needle thread loop at one side of the meeting edges of the fabric sections, and positions its own thread loop at the other sideof the fabric sections for the needle toent'er on its nextreciprocation. The

. said sections will be joined by stitches which are concealed from-view on one-side of the fabric, and stitches which completely cover and conceal the meeting edges of the fabric sections on the other side of the fabric.

From the above it will be apparent thata sewing machine has been provided which is especially adapted to join'the meeting edges of fabric sections in a flat seam. When the edge portions are joined without, folding, they are brought into abutted relation, but

@ inclined relative toeach other so that the line where the edges meet is raised above the remaining portions of the fabric sections. In

this position, the needle is passed into one section, and through the meeting faces of the edge portions, and then into and out of the l other section. The covering stitches will completely cover the meeting line of the edges of the fabric sections when they are pressed back into flat relation to each other. When the edges which are 'oined are folded, a similar placing of the e ge portions is necessary,

and the needle passes through the fabric sections and the abutted folded contacting portions in the manner similar to that above described.

' lit is obvious that various changes in the details of construction described may be made without departing from the spirit of the invention as set forth in the appended claims; Havingtlius described theinvention, what we claim as new and desire vto secure by Lettars-Patent, is

1., A sewing machine including in combi-- nation, a frame, a work supporting arm suspended therefrom and having a feed dog arranged for feeding the material lengthwise of and ofl' the end of said arm, a housing carried by said frame and overhanging the free i end of said work supporting arm, a presser 0 foot, and cooperating stitch forming elements mounted in said housing and disposed so as to form blind stitches in the material on the work supporting arm.

2. A sewing machine including in combination, a frame, a work supporting arm suspended therefrom and having a feed dog arranged for feeding the materialdengthwise v of and 0d the end of said arm,fa housing carried by said frame and overhanging the free and ofsaid work supporting arm, apresser foot, cooperating stitch forming elements mounted in saidhousing and disposed so as to form blind stitches in the material on the work supporting arm, and means for raising and lowering the stitch forming elements relative to the work'supporting arm.

3. A sewing machine including a frame, a work supporting arm suspended therefrom and having a feed dog arranged for feeding the material lengthwise of and off the end of said arm, a housing carried by said frame and overhanging the free'end of said work mechanism mounted in said housing and cooperating with said needle.

4. A sewing machine including a frame, a work supporting arm suspended therefrom and having a feed dog arranged for feeding the material off from the end of said arm, a housing carried by said frame and overhanging the free end of said work supporting arm, a presser foot, said presser foot and work supporting arm havmg means for positioning the fabric sections at an angle to each other centrally of the presser foot,a needle actuating mechanism mounted in said housing and carrying a needle adapted to enter and emerge from the fabric sections on the same face thereof, a looper actuating mechanism mounted in said housing and cooperating with said-needle, said means for actuating the needle and said means for actuating the looper being mounted on a common support, and means for raising and lowering said support in the housing for varying the position of the path of reciprocation of port carried by said depending member and terminating beneath the end of said over:

hanging arm, a feed dog in said work supporting arm for feeding the material ofi the end thereof, a presser foot cooperating with the feed dog, said presser foot and work supporting arm being shaped so as to hold fabric sections which are to be joined "at an angle to'each other, with their meeting edges at the highest point, a stationary shaft mounted in said overhanging arm and extending in a direction parallel with the longitudinal axis of said work supporting arm, a needle lever pivotally supported on said shaft, a needle carried by said needle lever and arranged so as to enter and emerge from said fabric sections on the F same face thereof, a looper,

means for mounting said looper on said stationary shaft, and means for actuating said nated with the needle thread and laid across the meeting edges of the fabric sections.

6. A sewing machine including a frame having an overhanging arm, adepending member mounted On the frame, port carried by said depending member and terminating beneath the end of said overhanging arm, a feed dog in said work supporting arm for feeding the material ofi the end thereof, a presser foot cooperating with the feed dog, said presser foot and work supporting arm being shaped so as to hold fabric sections which are to be joined at an angle to each other, with their meeting edges at the highest point, a stationary shaft mounted in said overhanging arm and extending in a direction parallel with the longitudinal axis of said work supporting arm, a needle lever pivotally supported on said shaft, a needle carried by said needle lever and arranged so as to enter and emerge from said fabric sections on the same face thereof, a looper, means for mounting said looper on said stationary shaft, means for actuating said looper whereby the looper thread is concatenated with the needle thread and laid across the meeting edges of the fabric sections, and means for raising and lowering said shaft for varying the position of the path of reciprocation of the needle relative to the work su porting arm.

E. A sewing machine including in combination, a supporting frame having an overhanging arm, a work support beneath said overhanging arm, said work support having inclined faces for holding fabric sections to be joined at an angle to each other with their meeting edges at the highest point, a stationary shaft mounted in said overhanging arm, a needle lever mounted on said shaft, an actuating shaft mounted in said overhanging arm and connected to said needle lever for reci roeating the same, a curved needle carried y said needle lever and adapted to enter one of said fabric sections and emerge from the other, a looper, a looper shaft, a sleeve mounted on said stationary shaft for supporting said looper shaft, means for oscillating said looper shaft in said sleeve,

means for raising and lowering said looper shaft in said sleeve, and means for oscillating said sleeve on its support, whereby said looper is moved into the needle thread loop at one side of the meeting edges of the fabric sections, and then is raised and carried across the meeting edges of the fabric sections and lowered at the other side thereof for the needie to enter the looper thread loop.

8. A sewing machine including in combination, a supporting frame having an overhanging arm, a work support beneath said overhanging arm, said work support having inclined faces for holding fabric sections to be joined at an angle to each other with their meeting edges at the highest point, a staa work suptionary shaft mounted in said overhanging arm, a needle lever mounted on said shaft, an actuating shaft mounted in said overhanging arm and connected to said needle lever for reciprocating the same, a curved needle carried by said needle lever and adapted to enter one of said fabric sections and emerge from the other, a looper, a looper shaft, a sleeve mounted on said stationary shaft for supporting said looper shaft, means for oscillating said looper shaft in said sleeve, means for raising and lowering said looper shaft in said sleeve, means for oscillating said sleeve on its support whereby said looper is moved into the needle thread loop at one side of the meeting edges of the fabric sections and then is raised and carried across the meeting edges of the fabric sections and lowered at the other side thereof for the needle to enter the looper thread loop, and means for raising and lowering said shaft for varying the position of the path of the needle relative to the work support. 7

9, A sewing machine including in combination, a supporting frame having an overhanging arm, a work support beneathsaid overhanging arm, said work support having lnclined faces for holding fabric sections to be joined at an angle to each other with their meeting edges at the highest point, a stationary shaft mounted in said overhanging arm, a needle lever mounted on said shaft, an actuating shaft mounted in said overhanging arm and connected to said needle lever for reciprocating the same, a curved needle carried by said needle lever and adapted to enter one of said fabric sections and emerge from theother, a looper, a looper shaft, a sleeve mounted on said stationary shaft for supporting said looper shaft, means for oscillating said looper shaft in said sleeve, means for raising and lowering said looper shaft in said sleeve, means for oscillating said sleeve on its support, whereby said looper is moved into the needle thread loop at one side of the meeting edges of the fabric sections and then is raised and carried across the meeting edges of the fabric sections and lowered at the other side thereof for the needle to enter the looper thread loop, said means for raising and lowering the looper includlng a lever mounted on said sleeve and oscillating therewith, a link connecting said lever to the looper supporting shaft, a lever mounted on the first-named shaft, a link connecting said last-named lever to the lever mounted on the sleeve, and means operated by said actuating shaft for oscillating the lever on the first-named shaft.

10. A sewing machine including in combination, a supportin frame having an overhanging arm, a wor support beneath said overhanging arm, said work support having inclined faces for holding fabric sections to be joined at an angle to each other with their reciprocating the same, a curved needle car-' ried by said needle lever and adapted to enter.

one of said fabric sections and emerge from the other, a looper, a looper shaft, a sleeve mounted on said stationary shaft for supporting said looper shaft, means for oscillating said looper shaft in said sleeve, means for raisin and lowering said looper shaft in said s eeve, means foroscillating saidsleeve on its support, whereby said looper ismoved into the needle thread loop at one side of the meeting edges of the fabric sections and then is raised and carried across the meeting edges of the fabric sections and lowered at the other side thereof for the needle to-enter the looper thread loop, said means for oscillating the looper shaft including an eccentric on the actuating shaft, an

eccentric strap cooperating therewith, and

- a ball stud mounted on the-looper shaft to which said eccentric strap is connected.

11; A sewing machine including in combination, a supporting frame having an overhanging arm, a work support beneath said overhanging arm, said work support having inclined faces for holding fabric sections to be joined at an angle to each other with their meeting edges at the highest point, a stationary shaft mouned in said overhanging arm, a

needle lever mounted on said shaft, an actuating shaft mounted in said overhanging arm and connected to said needle lever for reciprocating the same, a curved needle carried by said needle lever and adapted to enter one of said fabric sections and emerge from the other, a looper, a looper shaft, a sleeve mounted on said stationary shaft for supporting said looper shaft, means for oscillating said looper shaft in said sleeve, means for raising and lowering said looper shaft in said sleeve,

means for oscillating said sleeve on its. support, whereby said looper is movedinto the needle thread loop at one side of the meeting edges of the fabric sections and then is raised and carried across the meeting edges of the fabric sections and lowered at the other side thereof for the needle to enter the looper thread loop, said means for oscfillatingsaid sleeve including an eccentric on the actuating shaft, and an eccentric strap cooperating therewith andconnected to a ball stud on said sleeve.

12. A sewing machine including in combination, a work support, a feed dog, a pressmounted in said overhangln er foot cooperating with'said work support, an overhanging arm, a stationary shaft ,arm, a lever pivotally supported ;b said needle'carried by sai lever and adapted to enter and emerge from the fabric being aft, a curved,

stitched on thesame face thereof, said slfift being supported in a line parallel with the line of feed, an actuating shaft mounted in I "said overhanging arm, an eccentric carried thereby, an eccentric strap cooperating with the eccentric and connected to the needle I ing in substantially a vertical directioniin which said looper shaft is mounted, meansoperated by said actuating shaft for oscil lating said looper-shaft in said sleeve, meansoperated by said actuating shaft for raising and lowering saidlooper shaft in said sleeve,"

and means operated by said actuating shaft for oscillating. said sleeve on said stationary shaft whereby said looper may be caused to enter the needle thread loop where the needle emerges from the material and before passing into the material.

13. A sewing machine including in combination, a work support, a feed dog, a presser foot cooperating with said work support, an overhanging arm, a stationary shaft mounted in said overhangin arm, a lever pivotally supported by said s aft, a curved needle carried by said-lever and adapted to enter and' emerge from the fabric being stitched on the same face thereof, said shaft being supported in a line parallel with the osition the looper thread loop for the nee le to enter aCtuat'ing shaft for raising and lowering said looper shaft in said sleeve, means operated by said actuating shaft for oscillating said sleeve on said stationary shaft whereby said loope'r may be causedlto enter the needle thread loop where the needle emerges from the material and position the looper thread loop for the needle to enter before passing into the material, and means for raising and lowering said stationary shaft for varying the position of the path' of reciprocation of the needle relative to the work support.

14. bination, a frame, an overhanging arm having a housing at the outer end thereof, a sta- A sewing machine including in comtionarv shaft in said housing extending a transversely thereof, an actuating shaft in said overhanging arm extending. transversely thereof, a needle lever mounted on said stationary shaft, means operated by said actuating shaft for oscillating said needle lever, a curved needle carried by said needle lever, a looper shaft, a looper carried thereby, a sleeve mounted on said Stationary shaft and extending substantially in a vertical direction in which said looper shaft is mounted, means for oscillating the looper shaft and moving the same endwise in said sleeve, means for oscillating said sleeve, and means for raising and lowering said stationary shaft in the housing.

15. A sewing machine including in combination, a frame, an overhanging arm having a housing at the outer end thereof, a stationary shaft in said housing extending transversely thereof, an actuating shaft in said overhanging arm extending transversely thereof, a needle lever mounted on said stationary shaft, means operated by said actuating shaft for oscillating said needle lever, a curved needle carried by said needle lever, a looper shaft, :1 looper carried thereby, a sleeve mounted on saidstationary shaft and extending substantially in a vertical direction in which said looper shaft is mounted, means for oscillating the looper shaft and moving the same endwise in said sleeve,

means for oscillating said sleeve, means for raising and lowering said stationary shaft in the housing, said means for raising said shaft including pins mounted in bearings in said housing and extending into recesses in the respective ends of the shaft, said pins having inclined faces adapted to engage inclined faces in said recesses, and means for moving said pins endwise.

16. A sewing machine including in combination, a frame, an overhanging arm having a housing at the outer end thereof, a stationary shaft in said housing extending transverselythereof, an actuating shaft in said overhanging arm extending transversely thereof, a needle lever mounted on said stationary shaft, means operated by said actuating shaft for oscillating said needle lever, a curved needle carried by said needle lever, a looper shaft, a

looper carried thereby, a sleeve mounted on said stationary shaft and extending substantially in the vertical direction in which said looper shaft is mounted, means for oscillating the looper shaft and moving the same endwisein said sleeve, means for oscillating said sleeve, means for raising and lowering said stationary shaft in the-housing, said means for raising said shaft including pins mounted in hearings in said housing and extending into recesses in the respective ends of the shaft, said pins having inclined faces adapted to engage inclined faces in said recesses, a sleeve nut on the end of each pin having threaded engagement therewith, each sleeve nut having an engagement with the housing which permits the same to rotate and holds the sleeve from endwise movement, whereby the rotation of the sleeve will move the pin endwise in the housing.

17. A sewing machine including in combination, a frame, an overhanging arm having a housing at the outer end thereof, a stationary shaft in said housing extending transversely thereof, an actuating shaft in said overhanging arm extending transversely thereof, a needle lever mounted on said stationary shaft, means operated by said act-uat-ing shaft for oscillating said needle lever, a curved needle carried by said needle lever, a looper shaft, a looper carried thereby, a sleeve mounted on said stationary shaft and extending substantially in the vertical direction in which said looper shaft is mounted, means for oscillating the looper shaft and moving the same endwise in said sleeve, means for oscillating said sleeve, means for raising and lowering said stationary shaft in the housing, said means for raising said shaft including pins mounted in bearings in said housing and extending into recesses in the respective ends of the shaft, said pins having inclined faces adapted to engage inclined faces in said recesses, a sleeve nut on the end of each pin having threaded engagement therewith, each sleeve nut having an engagement with the housing which permits the same to rotate and holds the sleeve from endwise movement, whereby the rotation of the sleeve will move the'pin endwise in the hous in g, and a spring in the recess bearing against the under face of the pin and against the lower face of the recess for yieldingly forcing said shaft downward into supporting engagement with the pin.

18. A sewing machine including in combi' nation a frame, an overhanging arm carried by said frame, a work support beneath the free end of said arm, a presser foot, a stitching mechanism mounted on said overhanging arm and adapted to form blind stitches in the folded back portions of fabric sections carried by the work support, cooperating trimming devices located in rear of the stitch forming mechanism and positioned so as to trim one of the folded back portions a predetermined distance from the formed stitches, and cooperating trimming devices located in rear of the stitch forming mechanism and positioned so as to trim the other folded back portion a predetermined distance from the formed stitches.

19. A sewing machine including in combination, a frame, an overhanging arm carried thereby, a work support beneath the free end ing trimming devices located in rear of the stitch forming mechanism and positioned so as to trim the other folded back portion a predetermined distance from the formed stitches.

In testimony whereof, We aflix our signatures.

KARL MAIER. FRIEDRICH LUTZ. 

